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Chili pepper

life science Maturity 9-11 Next article →

Chili peppers are the bright, colorful fruits of plants in the genus Capsicum.

Capsicum clip art
Capsicum clip art

These plants belong to the nightshade family, known as Solanaceae. People cultivate them all over the world for their unique pungency, which is the spicy heat they provide. This heat is used as a spice to add intense flavor to many different cuisines. Botanically speaking, these fruits are actually classified as berries. Because they can be grown in various environments, they are used in many different ways, from fresh eating to making dried powders and sauces.

Chilli pepper 4
Chilli pepper 4

The intense heat of a chili pepper comes from specific chemical compounds. These include capsaicin and several related chemicals called capsaicinoids. Capsaicin is a colorless, odorless, and waxy solid at room temperature. The plant produces these substances as a natural defense mechanism against mammalian predators. By producing capsaicin, the plant may also protect itself from certain bugs that carry diseases. When a human eats a pepper, these chemicals bind to pain receptors in the mouth and throat. This action sends signals to the brainstem and thalamus, where the body perceives heat and discomfort. Interestingly, birds are unable to perceive this heat, allowing them to eat the fruit without any pain.

There are five main species of Capsicum that are widely cultivated today. These species are Capsicum annuum, Capsicum baccatum, Capsicum chinense, Capsicum frutescens, and Capsicum pubescens. Each species can produce fruits with very different characteristics. The fruits vary in color, appearing as green, orange, red, or purple. They also come in many shapes, ranging from smooth and elongated to round and knobbly. The intensity of the heat depends on the specific variety and the conditions in which it grows. For example, peppers that experience water stress often produce fruit with a higher concentration of capsaicin.

Chili peppers have a very deep history in the Americas. The plants originated in what is now Peru and Bolivia. Humans have included them in their diets since approximately 7,500 BC. This makes them one of the oldest cultivated crops in the Americas. In east-central Mexico, cultivation was already happening about 6,000 years ago. Peru is a significant center of diversification for these plants. In pre-Columbian times, all five domestic species were introduced and grown there. In Bolivia, there is a high diversity of wild Capsicum peppers.

Leiden University Library - Seikei Zusetsu vol. 25, page 019 - 蕃椒 - Capsicum annuum L., 1804 (cropped)
Leiden University Library - Seikei Zusetsu vol. 25, page 019 - 蕃椒 - Capsicum annuum L., 1804 (cropped)

European explorers changed how chilies were distributed globally. Christopher Columbus and his crew were the first Europeans to encounter these fruits in the Caribbean. They named them "peppers" because their heat reminded them of black pepper. The Spanish brought these plants back to Europe during the Columbian Exchange. This was a large-scale interchange of plants and culture between the New World and the Old World. By the mid-1500s, chilies were common in Spanish gardens. From there, they spread rapidly to Africa and Asia via Portuguese and Spanish traders. By the late 16th century, they had reached the Philippines and various Pacific Islands.

Madame Jeanette and other chillies
Madame Jeanette and other chillies

Scientists use specific scales to measure the intensity of the heat. In 1912, an American pharmacist named Wilbur Scoville invented the Scoville heat unit, or SHU. Historically, this was measured by diluting chili extract in sugar syrup until the heat was no longer detectable. A bell pepper has 0 SHU, meaning it has no heat. A Cayenne pepper typically ranges from 30,000 to 50,000 SHU. Some varieties are much more extreme. For instance, the Pepper X from the United States has a rating of 2.69 million SHU. Since the 1980s, scientists have used a method called high-performance liquid chromatography to measure capsaicin concentrations more precisely.

Global production of chili peppers is massive and varies by type. In 2024, the world produced 45 million tonnes of green chilies and peppers. China is the largest producer, accounting for 39% of this total, while India produces 12%. The production of dry chilies and peppers was 5.5 million tonnes in 2024. This market is led by China, Thailand, and Bangladesh. Beyond their culinary use, chilies are also important in traditional medicine. They are a rich source of nutrients, providing vitamin C and vitamin B6.

Capsicum -Chili - Peperoncino - Il Viagra Calabrese - Calabria - Italy - July 17th 2013 - 02
Capsicum -Chili - Peperoncino - Il Viagra Calabrese - Calabria - Italy - July 17th 2013 - 02
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🖼️ Images & Media (6)
File:Madame Jeanette and other chillies.jpg
Madame Jeanette and other chillies.jpg
File:Leiden University Library - Seikei Zusetsu vol. 25, page 019 - 蕃椒 - Capsicum annuum L., 1804 (cropped).jpg
Leiden University Library - Seikei...
File:Capsicum clip art.png
Capsicum clip art.png
File:Chilli pepper 4.svg
Chilli pepper 4.svg
File:Black Pearl - Ornamental Pepper.JPG
Black Pearl - Ornamental Pepper.JPG
File:Capsicum -Chili - Peperoncino - Il Viagra Calabrese - Calabria - Italy - July 17th 2013 - 02.jpg
Capsicum -Chili - Peperoncino - Il Viagra...
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